Number Memory Test — How Many Digits Can You Hold?
A number appears for a few seconds — memorize it, then type it back. Each success adds one digit.
Your digit span
The number was
You typed
This is an entertainment self-check, not a clinical digit span. Spans vary widely with sleep, stress and attention. If everyday recall is a real worry, that is a conversation for a clinician.
About the Number Memory Test
This free Number Memory Test measures your digit span — how many digits you can hold in short-term memory at once. A number flashes on screen, you type it back, and every correct answer makes the next number one digit longer. The first mistake ends the run, and your result is the longest number you recalled perfectly.
Psychology has a famous rule of thumb here: most adults hold about seven digits, plus or minus two. That is part of why phone numbers grew up the way they did. Reaching nine or ten takes genuine focus, and past eleven you are in the territory of people who practice memory techniques like chunking — grouping digits into twos and threes, the same trick everyone uses for phone numbers.
The display time grows with the number, so long numbers stay fair, and the first digit is never a zero. Everything runs in your browser with nothing recorded. It pairs well with the sequence-based memory test on this site, which tests position and order rather than pure digits — a different muscle of the same memory.
Miller (1956), "The Magical Number Seven, Plus or Minus Two" (full text)
How the number memory test works
- Press Start — a 3-digit number appears with a draining time bar.
- Memorize it before the bar empties. There is nothing to type yet — the input box only appears once the number is gone.
- Type the number and press Submit or Enter.
- Each correct answer adds one digit to the next number.
- One mistake ends the run and shows your digit span.
- Try chunking — grouping digits in twos and threes — and run again.
Number Memory Test FAQ
What is an average digit span?
Around seven digits, plus or minus two — the classic short-term memory finding. Five to six is common and completely normal, and nine or more without training is unusual.
How can I improve my span?
Chunking is the honest shortcut: read 8-2-7-3-9-1 as 82-73-91 and you halve what you store. Saying the digits in a rhythm helps too. With a little practice most people gain two or three digits.
Why does the number disappear so quickly?
The display time actually grows with each digit — one second plus a third of a second per digit. Keeping it brief is the point: with unlimited time you would be testing patience, not memory.
How is this different from the sequence memory test?
This test measures pure digit span — how much fits in the loop at once. The sequence test on this site measures spatial order — which pads lit up, in which order. They are different parts of short-term memory and scores often differ.
Does a low result mean something is wrong with my memory?
No. This is an entertainment game, spans vary widely with sleep, stress, and attention, and no browser game can assess memory disorders. If everyday memory genuinely worries you, a clinician is the right address.
Is anything recorded?
No. The numbers and your answers stay in the browser and vanish when you leave the page. No account, no upload, no tracking.
Is the Number Memory Test free, and do I have to register?
Free, with no registration, no email and nothing to install. You can also stop whenever you like — there is no minimum number of rounds and no result waiting to be unlocked at the end of a set.
Is this the same as the digit span test used in clinics?
No, and the difference is in how it is delivered. A clinical digit span is read aloud by an examiner at a fixed pace, forwards and then backwards, and scored against norms for your age. Here the digits arrive on a screen and you type them back, which is a different task using the same idea. Treat the number as a personal reference point, not a clinical score.
Is there a minimum age? Can children take it?
There is no age limit and nothing to register. The floor is simply being able to read the digits and type them back, so a child who manages that can play. Two things are worth knowing before you read a child’s number. The seven-plus-or-minus-two figure quoted above is an adult one, and this page scores nobody against age norms — the clinical digit span does that, and this is not it. So treat a child’s longest run as their own mark to beat rather than a rank. And remember the run ends at the first mistake, which can make one unlucky typo look like a much shorter span than the one they have.